Question

Can a body have
a.Zero instantaneous velocity and yet be accelerating?
b.Zero average speed but non-zero average velocity?
c.Negative acceleration and yet be speeding up?
d.The magnitude of average velocity be equal to average speed?

Answer 1

(a) NO, $a=\frac{dv}{dt}$ Since $V$ is $0$; $a$ will be zero.

(b) No, vice versa is possible because distance $>$ displacement.

(c) Yes, speeding up in negative direction.

(d) Yes, when distance= displacement.